class Solution {
 public:
  string originalDigits(string s) {
    string ans;
    vector<int> count(10);

    for (const char c : s) {
      if (c == 'z')
        ++count[0];
      if (c == 'o')
        ++count[1];
      if (c == 'w')
        ++count[2];
      if (c == 'h')
        ++count[3];
      if (c == 'u')
        ++count[4];
      if (c == 'f')
        ++count[5];
      if (c == 'x')
        ++count[6];
      if (c == 's')
        ++count[7];
      if (c == 'g')
        ++count[8];
      if (c == 'i')
        ++count[9];
    }

    count[1] -= count[0] + count[2] + count[4];
    count[3] -= count[8];
    count[5] -= count[4];
    count[7] -= count[6];
    count[9] -= count[5] + count[6] + count[8];

    for (int i = 0; i < 10; ++i)
      for (int j = 0; j < count[i]; ++j)
        ans += i + '0';

    return ans;
  }
};
